Which of the Following Is True Regarding the Grand Jury

Which of the following is true regarding the grand jury system?

A) Under the U.S. Constitution, a grand jury is required in state court felony cases.
B) Under the U.S. Constitution, a grand jury is required in federal felony cases.
C) The right to a grand jury may not be waived by a defendant.
D) Under the U.S. Constitution, a grand jury is required in state court felony cases and in federal felony cases and the right to a grand jury may not be waived by a defendant.
E) Under the U.S. Constitution, a grand jury is required in both state and federal felony cases, but a defendant may waive the right to review by a grand jury.